Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/samplecode/SamplePatch.cpp b/samplecode/SamplePatch.cpp
index 9ada9ef..dc3e9df 100644
--- a/samplecode/SamplePatch.cpp
+++ b/samplecode/SamplePatch.cpp
@@ -42,7 +42,7 @@
     SkPoint pts[] = { { 0, 0, },
                       { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
     SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
-    return SkGradientShader::CreateLinear(pts, colors, NULL,
+    return SkGradientShader::CreateLinear(pts, colors, nullptr,
                     SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode);
 }
 
@@ -74,7 +74,7 @@
     samples[0] = cubic[0];
     for (int i = 1; i < segs; i++) {
         t += dt;
-        SkEvalCubicAt(cubic, t, &samples[i], NULL, NULL);
+        SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr);
     }
 }
 
@@ -199,9 +199,9 @@
         }
         t += dt;
         canvas->drawVertices(SkCanvas::kTriangleStrip_VertexMode, stripCount,
-                             strip, doTextures ? tex : NULL,
-                             doColors ? colors : NULL, NULL,
-                             NULL, 0, paint);
+                             strip, doTextures ? tex : nullptr,
+                             doColors ? colors : nullptr, nullptr,
+                             nullptr, 0, paint);
     }
 }
 
@@ -294,7 +294,7 @@
         patch.setPatch(fPts);
         drawpatches(canvas, paint, nu, nv, &patch);
 
-        paint.setShader(NULL);
+        paint.setShader(nullptr);
         paint.setAntiAlias(true);
         paint.setStrokeWidth(SkIntToScalar(5));
         canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
@@ -347,7 +347,7 @@
 
     bool onClick(Click* click) override {
         fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY);
-        this->inval(NULL);
+        this->inval(nullptr);
         return true;
     }